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Despite its fundamental role in the dynamics of compressible fluids, bulk viscosity has received little experimental attention and there remains a paucity of measured data. Acoustic spectroscopy provides a robust and accurate approach to measuring this parameter. Working from the Navier-Stokes model of a compressible fluid one can show that the bulk viscosity makes a significant and measurable contribution to the frequency-squared acoustic attenuation. Here we employ this methodology to determine the bulk viscosity of Millipore water over a temperature range of 7 to 50°C. The measured attenuation spectra are consistent with the theoretical predictions, while the bulk viscosity of water is found to be approximately three times larger than its shear counterpart, reinforcing its significance in acoustic propagation. Moreover, our results demonstrate that this technique can be readily and generally applied to fluids to accurately determine their temperature dependent bulk viscosities.
Author(s): Parker NG; Holmes MJ; Povey MJW
Publication type: Article
Publication status: Published
Journal: Journal of Physics: Conference Series
Year: 2011
Volume: 269
Issue: 1
ISSN (print): 1742-6588
ISSN (electronic): 1742-6596
Publisher: Institute of Physics Publishing Ltd.
URL: http://dx.doi.org/10.1088/1742-6596/269/1/012011
DOI: 10.1088/1742-6596/269/1/012011
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